1. Reproductive Endocrine Unit (S.A., J.M.A., M.K.M., J.E.H., C.K.W.), Massachusetts General Hospital, Boston Massachusetts 02114
2. Department of Medicine (M.K.M.), Massachusetts General Hospital, Boston Massachusetts 02114
3. Department of Pathology (M.D.P.), University of Colorado Denver, Aurora, Colorado 80045
4. Department of Biostatistics (D.L.H.), Massachusetts General Hospital, Boston Massachusetts 02114